public bool OnNavigationItemSelected(int itemPosition, long itemId)
{
var adapter = ItemsSourceAdapter.Get(_actionBar);
if (adapter == null)
{
return(false);
}
ActionBarSelectedItemMember.SetValue(_actionBar, adapter.GetRawItem(itemPosition));
return(true);
}
private static void ActionBarSelectedItemChanged(ActionBar actionBar, AttachedMemberChangedEventArgs <object> args)
{
switch (actionBar.GetNavigationMode())
{
case ActionBarNavigationMode.List:
var adapter = ItemsSourceAdapter.Get(actionBar);
if (adapter == null || adapter.ItemsSource == null)
{
return;
}
if (args.NewValue == null)
{
args.Member.SetValue(actionBar, new[] { adapter.GetRawItem(actionBar.SelectedNavigationIndex) });
}
else
{
actionBar.SetSelectedNavigationItem(adapter.GetPosition(args.NewValue));
}
break;
case ActionBarNavigationMode.Tabs:
var tabGenerator = ItemsSourceGeneratorBase.Get(actionBar) as ActionBarTabItemsSourceGenerator;
if (tabGenerator == null)
{
var tabValue = args.NewValue as ActionBar.Tab;
if (tabValue != null && tabValue.Position != actionBar.SelectedNavigationIndex)
{
tabValue.Select();
}
}
else
{
if (args.NewValue == null)
{
object ctx = actionBar.SelectedNavigationIndex < 0 ? null : actionBar.SelectedTab;
if (ctx != null)
{
ctx = BindingServiceProvider.ContextManager.GetBindingContext(ctx).Value;
}
args.Member.SetValue(actionBar, new[] { ctx });
}
else
{
tabGenerator.SetSelectedItem(args.NewValue);
}
}
break;
}
}
private static void ActionBarUpdateItemsSource(ActionBar actionBar)
{
switch (actionBar.GetNavigationMode())
{
case ActionBarNavigationMode.List:
IItemsSourceAdapter sourceAdapter = ItemsSourceAdapter.Get(actionBar);
if (sourceAdapter == null)
{
sourceAdapter = ItemsSourceAdapter.Factory(actionBar, actionBar.ThemedContext, DataContext.Empty);
ItemsSourceAdapter.Set(actionBar, sourceAdapter);
actionBar.SetListNavigationCallbacks(sourceAdapter, new ActionBarNavigationListener(actionBar));
}
sourceAdapter.ItemsSource = ActionBarItemsSourceMember.GetValue(actionBar, null);
break;
case ActionBarNavigationMode.Standard:
ActionBarSelectedItemMember.SetValue(actionBar, BindingExtensions.NullValue);
actionBar.SetListNavigationCallbacks(null, null);
var generator = ItemsSourceGeneratorBase.Get(actionBar);
if (generator != null)
{
generator.SetItemsSource(null);
}
var adapter = ItemsSourceAdapter.Get(actionBar);
if (adapter != null)
{
adapter.ItemsSource = null;
}
break;
case ActionBarNavigationMode.Tabs:
var tabGenerator = ItemsSourceGeneratorBase.Get(actionBar);
if (tabGenerator != null)
{
tabGenerator.SetItemsSource(ActionBarItemsSourceMember.GetValue(actionBar, null));
}
break;
}
}